Solution : https://service.sap.com/sap/support/notes/923099 (SAP Service marketplace login required)
Key words :
Enqueue, OBJ$, LOCK, select for update, SMON, Deadlock
Related Notes :
| 745639 | FAQ: Oracle enqueues |
SAP Note 923099 - Locking background processes SMON in RAC environment
Component : Oracle Real Application Clusters (RAC) - Oracle